Recorder



March 16, 1937, R. w. R058 ET AL RECORDER Filed March 8, 1934 5 Sheets-Sheet 2 INVENTO S Wfi- CB0 M vi @910 y Md HIM-[7A #4 ATTORNEY March 16, 1937.

R. W. ROSS ET AL RECORDER Filed March 8, 1934 5 Sheets-Sheet 5 manual unnuannnnnhnnnnnnnn Til man! March 16, 1937.

R. w. Ross z=:r AL

RECORDER Filed March 8, 1954 5 Sheets-Sheet 4 March 16, 1937. R. w. Ross ET AL 2,074,118

RECORDER Filed March 8, 1934 5 Sheets$heet 5 FIG. IO

% ATTORNEY.

Patented Mar. 16, 1937 UNITED STATES PATENT OFFICE I nnconnnn. Raymond W. Ross and Sigurd H. Seberhagen, Leeds 8:

Philadelphia, Pa.,

assignors Northrup Company, Philadelphia, 1%., a corporation of Pennsylv Application March 8, 1934, Serial No. 714,546

21 Claims.

Our invention relates to new and improved recorders, and more particularly to a new and im- 7 recorder mechanism and associated chart mechanism or assembly may be swung outwardly of the supporting casing or housing as a unitary'structure to facilitate inspection, repair orreplacement of parts. When thus swung outwardly and substantially free of the casing, this unitary structure may be lifted bodily from its supports, as for replacement by a similar unit having adiiiereut range of response. In addition, the

record; chart assembly may be independentlyswung free of the recorder mechanism to aid in renewing the record chart or making necessary adjustments. In other words, the recorder mech-* anism and the chart assembly are independently movable relative to each other and if, as is usu ally the case, the recording pen or stylus is attached to the recorder mechanism, there is provision made whereby the record chart assembly may be swung free and away from the recorder mechanism without interference with the recording pen.

Further, our invention comprises means for insuring an accurate registration of the relatively movable mechanisms when brought into normal cooperative relation or engagement.

Our invention comprises a'new and improved recorder embodying one or more of the above features.

Referring now to the drawings, Fig. 1 is a view in front elevation of our improved recordershowlng particularly the mounting of the record chart assembly.

Fig. 2 is a fragmentary detail of a supporting hinge of the chartassembly shown in Fig. 1;

Figs. 3 and 4 are fragmentary cross-sectional views of a chart clip used with the chart assembly 50 of Fig. 1; 1

Figs. 5 and 6 are side elevations, partly in section, of our improved record chart assembly shown, respectively, in normal engagement with the recorder mechanism and out of engagement 55 therewith:

the recorder mechanism;

, Fig, 'l is a perspective view of a stop device together with a fractional showing of parts of the housing and one of the frames supported thereby.

Fig. 8 is a detailed front elevation of the stop device of Fig. 7 to aid in accurately registering 5 the recorder mechanism and its enclosing and supporting casing;

Fig. 8a is a plan view of the stop device shown in Figs. '7 and 8;

Fig. 9 is a view in rear'elevation of the record chart assemblyswung outwardly and free from Fig. 10 is a cross-sectional view of the record chart assembly, while Fig. 11 is a view in rear elevation of one form of recorder mechanism 15 suitable for use in connection with our invention.

Fig. 12 is a front elevatlonal view of the recorder with the cover open and thechart assembly swung out.

Referring now more particularly to Fig. 1, there is shown a recorder and a record chart assembly comprising an indicating scale Ill with which cooperates a suitable indicating pointer or needle ll operated by the actuating mechanism, not shown in this view. The pointer H embraces as part of a unitary structure a recording pen, stylus, marker, or print whcel,.a recording pen l2 being shown. It will be understood that any suitable recording device may be employed for in any way marking, printing, punching or otherwise efiecting on the chart, markable element, or record sheet a record in the form of acontinuous line or of a series of markings spaced from each other, and that either the term 35 marker or the term recorder pen, as used hereinafter in the specification and claims, is meant to include all such equivalent recording devices. The pen l2 cooperates with a record chart l3 of the continuous strip type. The chart 40 I3 is supported. from and driven by a suitable chart drum or reel H and is provided with perforations IS for registering with driving pins or lugs I! carried on the'ends of the drum ll which is supported on shaft 88, journalled in a chart frame 20. l

The record chart I3 'is rewound on a tubular mandrel or form l5 which may be, for example,

a cardboard or fibre form of the type on which rolls of chart paper are wound and supplied to the trade. The mandrel i5 is supported on projections l9c and Ma extending from platescor disks [8a. and i917, respectively. The plafes Ma and Nb are rigidly secured to andsupported.

from stub shafts We and is journalled in the chart frame 22.

The chart frame 20 is provided with projecting lugs or arms 2! and 22 which form corresponding elements of a pair of hinges, the stationary elements 23 and 24 of which are supported from any suitable enclosing casing or housing H.

The upper hinge member comprising the ele-' ments 2! and 23 includes also a hollow sleeve 25 which acts as a hinge pin. Within the sleeve 25 is journalled a shaft 250. which forms one element of a driving connection between the motor of the recorder mechanism, described hereinafter, and the chart drum M. As shown, a skew gear 26 is secured to the lower portion of the shaft 25a, cooperating with an additional skew gear 2'! which is driven from the recorder mechanism, as described hereinafter. Rigidly secured to the upper end of the shaft 25a is a worm 28 cooperating with a worm-wheel 29 journalled on the shaft It. The worm-wheel 29 is secured to the shaft E8 of the chart drum i l by a springwasher 6 (Fig. 9), serving as a friction clutch, or by any other suitable lost-motion device. There is provided also, for purposes later described, a friction clutch 30, one element 3! of which is secured directly to the shaft I8, while the other element is connected to a sprocket Wheel 32 journalled on shaft id of the chart drum Iii.

The lower supporting hinge of the chart assembly comprising the elements 22 and 2 5 includes a hinge pin 33 through the lower end of which extends a cotter pin 36. The hinge element 22 forming a part of the chart frame 20 includes a keyway or slot 35, shown more clearly in Fig. 2, while the hinge pin 33 carries a cooperating pin 36 engaging the slot in certain positions of the chart frame, as described more fully hereinafter. Pin 33, as appears in Figs.

1 and 2, is secured to the hinge projection Bil of the assembly frame it by the pin 33a.

There is provided also a latching mechanism for securing accurate registration between the relatively movable chart frame 29 and the frame of the recorder apparatus. This mechanism includes a supporting member 31 carried by and resting upon the upper end of the pin 33. .The member 31 is movable with the chart frame 2% 'and is keyed thereto by a pin 31a engaging a bore in the hinge element 22. Cooperating with the supporting member 31 is a cam 38 rigidly attached to shaft-39 which is journalled in the chart frame at wand '36. Attached to the other end of the shaft 39, as shown more clearly in Figs. 5 and 6, is a lever or latch 62. The latch 42 includes at one end a detent or slot 33 which engages a pin 44 supported from a projection 45 rigidly secured to the frame 86 (Fig. 5) of the recorder mechanism. The projection 35 carries also an adjustable stop 61 effective accurately to limit the movement of the chart frame 20 toward the recorder frame it by engaging the chart frame 20 at 68. The chart frame 20 carries also a projecting or interlocking arm &9 cooperating with the pin to to aid in securing proper registration between the chart frame 20 and the recorder mechanism frame t6, and to prevent relative movement therebetween when in certain relative positions. If desired, a suitable stop 50 may be attached to the chart frame to limit the movement of the latch 32.

The manner in which the latching mechanism, together with the lower hinge mechanism, is efiective to secure accurate registration beaxial relation. The relative angular position be tween the frames 20 and 68 is accurately determined by the adjustable stop M. Thus, accurate registration between the frames 20 and 636 is ensured and the record chart I3 is properly positioned with respect to the recording pen I2. The frames are retained in this position by means of the latch 42 which engages the pin 66.

When it is desired toeifect the disengagement of the pen l2 and the chart 13, or to swing the chart assembly free or away from the recorder mechanism, the latch 52 is moved clockwise to the position shown in Fig. 6. This moves the cam 38 in a counter-clockwise direction, as referred to Fig. 2, thus lowering the chart frame 28, which has a limited motion along its pivotal axis. As the chart frame is lowered by the cam 38, the slot 35 of the hinge element 22 disengages the stationary pin 36. Simultaneously, or approximately so, the detent $3 of the latch 52 disengages the pin lid and, as the chart frame is lowered, the projecting or interlocking arm 59 also moves below and thereby disengages the pin 56 so that the chart frame 20 is now completely free to swing about its pivotal axis to the right, as shown in Figs. 5 and 6, and away from the recorder mechanism. The assembly, as thus swung free of the recorder mechanism and casing and through 180, as referred to Fig. l, is shown in Figs. 9 and 12.

By lowering the chart frame before swinging it about its pivotal axis, any interference between the record chart and the recording pen I2 is eliminated or, in other words, the record chart freely clears the record pen in moving about its pivotal axis.

When the chart frame is swung to the positions shown in Figs. 6, 9, or 12, the pin 36 engages the upper surface of the hinge element 22 and prevents a raising of the chart frame 26. This is what might be termed a rough aligning or registering mechanism, and prevents the upward movement of the chart frame until in approximate normal registration with the recorder mechanism frame 46. mechanism, which prevents improper movement and possible resulting injury to the apparatus, is provided in the above-described latching mechanism. As the chart frame 20 is swung. through.

the position of Fig. 6 and into approximate registration with the recorder mechanism frame 65, at which time the pin 36 and slot 35 permit a raising of the chart frame 28, the upper surface of the projecting arm is engages the pin 36 attached to the frame and prevents a raising of the chart frame until the arm 59 hasmoved to clear the pin M, as shown in Fig. 5. The latch 512 may then be operated to raise the frame 28 by means of the cam 38 and to engage the pin M at the detent 63. In this manner an accurate registration between the frames 20 and 66 is insured and, at the same time, relative movement therebetween is precluded except when in such relative position about their pivotal axis as freely to clear or avoid interference with other parts of the apparatus. as the recording pen l2.

As stated above, the sprocket wheel 32 is driven by friction clutches 6 and 30 through shaft 25, journalled in the upper hinge pin. This sprocket wheel 32 is effective to drive, through a suitable chain 5|, a second sprocket wheel 52 attached to the lower rewind plate or disk ISb. Secured to the shaft I8 of the chart drum I4 is an adjustingknob 51 by means of which the record chart I3 may be properly calibrated upon initiating operation of the recorder, or by which a new.

record chart may be threaded through the chart assembly.

Associated with the lower rewind plate or disk I911 and connected to the stub shaft I9e is a pull button biased against the frame 20 by spring 56. By pulling the button, 55, the mandrel I5 may be removed with the roll of chart paper wrapper thereupon.

The friction clutches 30 and B have two functions; one is to permit operation of the drum I4 and the mandrel I5 by the manual adjusting knob 54 independently of the recorder driving motor, either properly to calibrate the chart I3 upon initiation of the operation of the recorder,

' or to thread anew roll of chart) paper through the chart assembly. In addition, the relative diameters of the chart drum I4 and the rewind mandrel I5 change with the winding of the record chart upon the mandrel I5. The frictional clutch 30 permits a certain amount of slippage to take care of the change in the relative diameters of the two drums. The frictional constants of the clutch 6 should obviously be greater than those of the clutch 30 to permit a driving through the clutch 6, even with a slippage of the clutch 30 under the last-mentioned conditions. By

mounting both friction clutches on the chart 1 drum shaft I8, which rotates at a speed less than the stub shaft I9f, greater frictional forces are present during the transmission of the required torque than would be the case if mounted on the shaft I93 of higher speed; therefore a wider latitude in designing the clutches is secured.

It has been found desirable, also, to use a pair of clips 5? provided with slots 58 riding over the projections ll of the chart drum it to improve the engagement between the chart l3 and the drum M. The clips 5? may be mounted in spring hinges 59, shown in cross-sectional detail in Figs. 3 and i, in closed and open positions, respectively.

Additional features of our improved record chart assembly may be seen by reference to Figs.

5, 6, 9 and 10. It will be noted that the record chart i3 is supplied from a chart feed roll so wound on a mandrel the and supported on stub shafts Si and file. The threaded stub shaft Sic may be laterally adjusted by knob 62a. and locked by means of a knurled lock nut 62. Shafts i3! and bill are provided with a pair of opposed bearing plates 63, one of which is biased by a suitable spring ti l toward the mandrel Eta. A pull button 55 is efiective to withdraw against the bias of spring til the bearing plate 63 to permit removal of the feed roll mandrel iiila when the record chart til thereon has become exhausted. If desired, the stub shaft l'Qf may be provided with an adjustable bushing iii secured in the frame 2b by lock nuts 66 in order that the rewind mandrel it may be maintained in accurate alignment with the main chart drum ill.

As shown particularly in Figs. 5 and f the record chart, after leaving the feed roll 60, passes between the shaft 39 of the latching mechanism and the frame 20 and upwardly between an aux iliary shaft or rod 51 supported in the frame 20 and thence over the chart drum i4.- The rods or shafts 61 and 353 are effective to increase the angle of engagement between the record chart and the drum I4 and, in addition, to introduce a small frictional drag to insure that the record chart is maintained taut. If desired, an idling pulley 68 may be journalled on the shaft 8'11 and the sprocket chain 5| passed thereover, thereby avoiding interference of the chain with other portions of the chart assembly.

The chart frame 20 includes, either as an integral or separable portion, the chart plate 59 which acts as a backing or support for the chart I3 throughout substantially its whole exposed area. At its upper end the chart plate 59 is extended into a curved portion approximately tangent to the chart drum as. The lower end of 'the chart plate 69 is rounded or curved and serves as a guide surface for the record chart fed to the rewind mandrel I5.

While the drive to the skew gears 25, N of Fig. 1 may be effected in any suitable manner, we have shown, in Fig. 9, one specific embodiment which has been utilized in our improved recorder. In this arrangement, a motor II, supported from the frame 68 of the recorder mechanism, drives the skew gear 211 through a gear train comprising a worm l2 and worm-wheel it,

a worm l4 and worm-wheel l5, and spur gears I6, if and 78. It will be understood that the -motor H is preferably a constant speed motor,

such as a synchronous electric motor, or any other electric motor, air turbine or other of the types of motors well-known in the art suitable for such purposes, the speed of which may be governed or controlled in any desired manner.

The mounting of the recorder. mechanism may be best understood by reference to Figs. 1 and 11. The recording mechanism is supported from the frame d5 provided with integral or separable hinge elements 19 and 30 receiving the hinge pin or sleeve 25 and pin 33, respectively. Thus, the recorder mechanism andthe record chart assembly are relatively movable about a common pivotal axis. In order to secure the recorder mechanism frame in accurate registration with other elements and within its enclosing housing H, the frame 35 is provided with an integral or separable projection 8i having 9. depending arm 82. Cooperating with the projection 8! is a bracket 83 (Figs. 1, 7, 8 and 8a) rigidily supported from the enclosing casing of the recorder. The bracket 83 has a horizontally extending arm on which is supported an adjustable stop M. The bracket 83 includes also an upstanding arm 85 from whichextends an arm 85. A horizontally extending stop 8i is supported in the arm 86. The upstanding arm. 85 carries a suitable latching spring 88 cooperating with an upstanding latching surface 8%] of the projecting arm st of the recorder mechanism frame, as shown most clearly in .Figs. '7 and 8a.

As the recorder mechanism frame d6 is moved about its pivotal axis from the position shown in Fig. 11 to that shown in Fig. l, the lower surface of the projection Bl engages the stop surface Bd, as shown in Fig. '7, and accurately determines the vertical positioning of the recorder mechanism frame. Also, the horizontally extending stop member 87 limits the angular motion of the frame 38 about its pivot (Fig. '7) and the latching spring 88, engaging the surface 89, retains the frame it in this predetermined position (Fig. 8a,). By this means, an accurate registra- 'mechanism. frame 46 and the chart frame 20,

when in proper registration, may be swung as a unitary structure about their common pivots 25 and 33 for the purpose of inspecting the mechanism without interrupting operation of the recorder. Also, when the frame 20 is swung bodily outward until it occupies the position shown in Fig. 9, the chart assembly may be lifted bodily from the casing by simply removing the pin 36 engaging the hinge element 22. Thereupon, the apparatus may be lifted as a unitary structure, the hinge element 2| sliding over the sleeve 25 and the worm 28 and the support 37 and hinge element 22 sliding over the hinge pin 33. This feature may be advantageous when it is desired to record quantities having large differences in their maximum values, as it facilitates the rapid interchange of chart mechanisms in accordance with the particular value of the quantity obtaining at a given time.

While any suitable type of recorder mechanism may be utilized in connection with our in vention, there are shown in Fig. 11 the essential features of one recorder mechanism which is particularly suitable for use in connection therewith, 'and which is shown and described in U. S. Letters Patent No. 1,935,732 granted November 21, 1933 upon the application of Lloyd Y. Squibb, to which reference is made for adetailed description thereof. In general, this recorder mechanism includes an indicating device, such as a galvanometer 90, provided with a deflectingneedle 9| and connected to be responsive to the condition which it is desired to record. The mechanism includes also a slidewire 92, together with cooperating stationary contact 93, the position of the slidewire 92 being intermittently adjusted, in accordance with the deflection of the needle 9|, by means of a clutch disk 94 and suitrotating shaft 95.

by bar 96 for movement by the cord 91 which is secured to the pen carriage and passes over the idler pulleys 98 pivotally secured to frame 56 and over the pulley 99 secured to the shaft of slidewire 92. v

In Fig. 12, the bracket 83 and associated parts are omitted for clarity.

While we have described what we at present consider the preferred embodiment of our invention, it will be obvious to those skilled in the art that various changes and modifications may be made without departing from our invention, and we therefore aim in the appended claims to cover all such changes and modifications as fall within the true spirit and scopeof our invention.

' What we claim is:

1. Recording apparatus comprising a housing, a marker, a unit comprising an actuating mechanism disposed in said housing and pivoted with respect thereto, a driving connection between said mechanism and said marker, and a second unit comprising a chart and driving mechanism therefor, pivoted within said housing for movement relative to said first-named unit.

2. A recorder comprising a casing, a recording pen, actuating mechanism therefor, a supporting frame for said mechanism pivotally mounted in said casing, a record chart, a supporting frame for said chart independently pivotally mounted in said casing, one of said frames being relatively movable in an arcuate path with respect to the other and the pivotal mounting of said frames enabling them to be swung outwardly from the engagement and disengagement ofsaid chart and said pen, the pivotal mounting of said frames enabling them to be swung outwardly from said casing.

4. A recorder comprising a casing, a recording pen, actuating mechanism therefor, a supporting frame for said mechanism, a record chart, a supporting frame for said chart, a common hinge element interconnecting said frames and said casing, a motor for operating said actuating mechanism mounted on its associated frame, and a driving connection between said motor and said chart maintained during relative pivotal movement of said frames.

5. A recorder comprising a casing, a recording pen, actuating mechanism therefor, a supporting frame for said mechanism, a record chart, a driving reel for said chart, a supporting frame for said reel, a common hinge element interconnecting said frames and said casing and providing for movement of one frame with respect to the other to effect the engagement and disengagement of said chart and said pen, a motor for operating said recorder mechanism mounted on its associated frame, and a driving connection between said motor and said chart reel including a worm coaxial with the pivot of said hinge and a cooperating worm wheel carried by said reelframe.

6. In a recorder, a marker, a supporting frame, an auxiliary frame pivotally supported with respect to said first frame about a Vertical axis and movable up and down along said axis, a record chart mounted in said auxiliary frame and movable therewith into and out of the plane of said marker, and stop mechanism for limiting pivotal motion of said auxiliary frame about its pivot when raised along its pivotal axis to a position in which said marker obstructs pivotal movement of said chart.

'7. In a recorder, a recording pen, a supporting frame, an auxiliary frame pivotally supported with respect to said first frame and movable along its pivotal axis, a record chart mounted in said auxiliary frame and movable therewith into and out of engagement with said pen, stop mechanism for limiting pivotal motion of said auxiliary frame about its pivot when in such position along its pivotal axis that said recording pen obstructs pivotal movement of said chart, and a cam mechpivotal axis to effect engagement and disengagement between said'recording pen and said chart.

8. In a recorder, a marker, actuating mechanism therefor, a supporting frame for said actuating mechanism, a record chart, a supporting frame for said record chart, said frames being pivotally interconnected and one frame relatively movable with respect to the other to effect the engagement and disengagement of said chart and said marker, a motor movably mounted relative to said. chart supporting frame, and a driving connection between said motor and said chart maintained during the relative movement therebetween.

9. In. a recorder, a marker, actuating mech anism therefor, a supporting frame for said actuating mechanism, a record chart, a supporting frame for said record chart, said frames being pivotally interconnected and one movable relatively to the other to effect the engagement and disengagement of said chart and said marker, a

mo r movably mounted relative to said chart supporting frame, and a driving connection between said motor and said chart including a driving element coaxial with the pivotal connection between said frames.

10. In a recorder, a marker, actuating mechanism therefor, a supporting frame for said mechanism, a record chart, a supporting frame for said record chart, said frames being pivotally interconnected and one frame relatively movable with respect to the other to effect the engagement and disengagement of said chart and said marker, an electric motor mounted insaid firstnamed supporting frame, and a geared'driving connection between said motor and said chart, one of the elements of said connection being coaxial with said pivotal connection and one being carried by said chart-frame;

11. In a recorder, a supporting frame fora recorder pen, a record chart, a supporting fra' 1e for said record chart, said frames being pivotally interconnected and one frame relatively movable with respect to the other to effect the engagement and disengagement of said chart and said pen, an electric motor mounted on said first-named supporting frame, and a driving connection between said motor and said chart including a worm coaxial with said pivotal connection, and a cooperating worm wheel carried by said chart-frame.

12. In a recorder, a marker, actuating mechanism therefor, a supporting frame for said actuating mechanism, a record chart, a supporting frame for said record chart, a hinge pin interconnecting said frames, one of said frames being relatively movable with respect to the other to effect the engagement and disengagement of said chart and said marker, a motor mounted on said firstnamed frame, and a driving connection between said motor and said chart including .two gears forming a unitary structure with said hinge pin, a cooperating gear driven by said motor, and a second cooperating gear driving said chart.

13. In a recorder, a marker, actuating mechanism therefor, a supporting frame for said actuating mechanism, a record chart, a supporting frame for said record chart, hinge means interconnecting said frames and including a hinge pin, one of said frames in addition to its pivotal movement being relatively movable with respect to the other to effect the engagement and disengagement of said chart and said marker, a motor mounted on said first-named frame, and a driving connection between said motor and said chart including a worm and a worm wheel, said porting frame for said mechanism pivotally otally interconnecting said frames and providing axis relative to the other to move said pen and said chart into and out of cooperative relation ship, stop means for. aligning said frames in proper angular and axial relation, and means for latching said frames together in aligned relation to maintain normal registration between said pen and said chart.

15. In combination, a pair of frames, exhibiting structure having a scale mounted on one of said frames and an element normally depend ing from the other of said frames below the upper edge of the scale and movable across the scale, means pivotally interconnecting said frames and providing for movement of one frame with respect to the other along the pivotal axis, and means for locking said frames together when said frames are in positions such that said element obstructs pivotal movement of said scale, said last-named means automatically releasing said frames for pivotal movement when said frames occupy positions such that said element is free of said upper edge of said scale.

16. A recorder comprising a casing, a recording pen andactuating' mechanism therefor, a supmounted on said casing, a record chart, a supporting frame for said chart independently pivotally mounted on said casing, one of said frames being relatively movable about a pivotal axis with respect to the other of said frames, and means for moving one of said frames parallel to said pivotal axis to move the pen out of cooperative relationship with the chart prior to said relative pivotal movement of said frames.

1'7. Recording apparatus comprising a support, a marker, actuating mechanism for said marker, a supporting frame for said mechanism pivotally mounted with respect to said support, a record chart, a frame pivotally mounted with respect to said support for supporting said chart in cooperative relation with said marker, one of said frames being pivotally movable with respect to the other of said frames, and means for imparting movement to one of said frames in addition to its pivotal movement to facilitate relative movement of said marker and chart out of cooperative relationship.

18. In a recorder, a marker, a marker-actuating mechanism, a supporting frame for said marker and its mechanism, a markable element, a supporting frame for said element, means pivotally interconnecting said frames and providing for movement of one frame along its pivotal axis to move into and out of cooperative relationship said marker and said element, and interlocking mechanism for insuring in sequence pivotal and axial movements of said one frame.

19. In a recorder, a marker, a marker-actuating mechanism, a supporting frame for said marker and its mechanism, a markable element, a supporting frame for said element, means pivfor' movement of one frame along its pivotal axis to move into and out of cooperative relationship said marker and said element, and a re- 6 acre, 1 is movable locking pin for normally limiting the axial movement of said one frame and effective upon removal to release said one frame for axial movement into disengaging relationship with said a markable element, driving mechanism therefor, a supporting frame for said element and said driving mechanism, pivotal connections between said frames and said support, one connection comprising a hollow sleeve secured to said SIGURD H. SEBERHAGEN.

CERTIFICATE OF CORRECTION.

Patent No. 2,074, 118.

March 16, 1937.

RAYMOND W. ROSS, ET AL.

5 other frame and said pivot means. support, said element-frame being movable ax- 5 20. In a recorder, a marker, actuating mechaially of its pivotal axis, cam mechanism for nism therefor, a supporting frame for said mechaxially moving said element-frame to bring said anism, ,a record chart, a supporting frame for markable element into and out of cooperative said chart, hinge-elements respectively secured relation with said marker, cooperating interlock- -l0 to, and pivotally interconnecting said frames, ing means supported respectively by said frames 10, one of said frames being relatively movable about for interlocking said frames when said marker a pivotal axis with respect to the other of said and element are in said cooperative relation, an frames, means for moving one of said frames operating member for said cam mechanism supparallel to said pivotal axis to move into and out ported on the side of said element-frame remote of cooperative relationship said marker and said from said pivotal connections, a latching mem- 15 chart, one of said hinge elements having a slot ber secured to said support, said operating mempre'sented to its associated hinge-element, and ber having a portion movable into latching ensaid associated hinge-element having a key movgagement with said latching member as said able into and out of said slot as said marker is markable element is moved into cooperative removed into and out of cooperative relation with lation with said marker, a shaft journaled within 20 said chart to prevent pivotal movement of said said sleeve, and gears secured at opposite ends frames when said key is within said slot. thereof to form a driving connection maintained 21. Recording apparatus comprising a support, at all times between said element-driving mech a marker, van actuating mechanism for said anism and said marker-actuating mechanism. marker, a supporting frame for said mechanism, RAYMOND W. ROSS. 25

It is hereby certified that error appears in the printed specification r" of the above numbered patent requiring correction as follows: Page 2, second column, line 5, stri 1e out the comma at beginning of line and indent the word "In" as a new paragraph; line 36, before the word "assembly" insert chart; line after "apparatus" strike out the period and insert instead a comma; page 4, second column, line 55, claim 6, after 'frame" insert for movement; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 24th day of August, A. D. 1937.

Leslie Frazer (Seal) Acting Commissioner of Patents. 

